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“S”型曲线的特点及各阶段的特征?
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“S”型曲线的特点及各阶段的特征?
时间:2022-01-10 00:00
关键词:
生态学
农学
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<p> “S”型曲线具有两个特点:<br> 1.曲线渐近于K值,即平衡密度;<br> 2.曲线上升是平滑的。逻辑斯谛曲线可划分5个时期:<br> (1)开始期:由于种群个体数很少,密度增长缓慢。<br> (2)加速期:随个体数增加,密度增长逐渐加快。<br> (3)转折期:当个体数达到饱和密度一半时,密度增长最快。<br> (4)减速期:个体数超过K/2以后,密度增长逐渐变慢。<br> (5)饱和期:种群个体数达到K值而饱和。</p>
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